1. You can. Personally I think the thread leaking issues with them make them more trouble than they are worth. I've come full circle and no longer recommend or install them.
2. See #1, but all 1150s use the same size as listed in the DIY post.
4. The goal is to change out as much fluid as possible, and the fluid that gets the most heat abuse is that in the caliper. So yes, it is worth doing.